Substituição do farelo de soja por levedura de cana-de-açúcar em rações para frangos de corte¹

Abstract

RESUMO -Esta pesquisa objetivou avaliar os efeitos da substituição da proteína do farelo de soja (FS) pela da levedura de cana-de-açúcar (LEV) em rações de frangos contendo farelo da castanha de caju (FCC). O total de 325 pintos machos com um dia de idade foram distribuídos em delineamento inteiramente casualizado, com cinco rações e cinco repetições de treze aves. Foram testadas cinco rações contendo 20% de FCC e os níveis de 0; 5; 10; 15 e 20% de substituição da proteína do FS pela da LEV. Conforme análise de regressão, houve efeito quadrático da substituição da proteína do FS pela da LE V sobre o consumo de ração e conversão alimentar e linear sobre o ganho de peso, na fase inicial (1 a 21 dias). Contudo, a substituição em níveis de até 20% não prejudicou significativamente o desempenho nas diferentes fases de criação e não alterou as características de carcaça em relação ao controle. Pelo estudo econômico, a substituição da proteína do FS pela da LEV se mostrou viável até o nível de 20%. Pode-se concluir que, em rações para frangos de corte, contendo 20% de FCC, a proteína do FS pode ser substituída pela da LEV em até 20%.Palavras-chave: Alimentação de frangos de corte. Alimento alternativo. Levedura. Subproduto da agroindústria.ABSTRACT -This research aimed to evaluate the effects of substituting the protein from soybean meal (SM) by yeast sugar cane (YSC) in broiler-chicken diets containing cashew nut meal (CNM). A total of 325 male chicks at one day old, were distributed completely randomly among five feeds with five replications of thirteen birds each. We tested five diets containing 20% CNM each and the levels of 0, 5, 10, 15 and 20% protein replacement of SM by YSC. According to regression analysis, there was a quadratic effect on feed intake and feed conversion by the protein replacement of SM by the YSC, and a linear effect on weight gain in the initial phase (1-21 days). However, substitution at levels up to 20% did not significantly impair performance at any of the different stages, and did not affect the carcass characteristics when compared to the control group. According to the economic study, the protein replacement of SM by YSC proved feasible up to 20%. It can be concluded that, for broiler-chicken diets containing 20% CNM, the SM protein can be replaced up to 20% YSC.

Enzyme complex and Saccharomyces cerevisiae in diets for broilers in the initial phase

“…There was an increase (p<0.05) in feed intake (FI=135.13 + 1.036YL, F 2 =0.87) and in feed conversion ratio (FCR=1.235+0.009YL, F 2 =0.69) at the rate the levels of yeast increased in the diet. The increased intake of higher levels of yeast, can be attributed to the higher demand of nutrients and energy, while considering the rigidity and low digestibility of its cell wall (FREITAS et al, 2013), as the broilers did not obtain an increase in weight gain. According to Perdomo et al 2004, the low utilization of the yeast cell wall by the animals reduces digestibility of the nutrients from the feed, and consequently its energetic value.…”

“…According to Perdomo et al 2004, the low utilization of the yeast cell wall by the animals reduces digestibility of the nutrients from the feed, and consequently its energetic value. If one considers that energy is the main factor that controls feed intake in broilers (FREITAS et al, 2013), and that there was a reduction in the energetic density of the diets (NC), this influence on feed intake was boosted, as the animals need to find more feed to attend to their energy needs, due to the low energy extraction from the feed. The comparison between the feed intake and feed conversion ratio data from the positive control, regarding the negative control at 12% yeast, reinforces this statement.…”

“…Sugarcane yeast and protein feed have been studied by researchers in the search for a substitute to soybean meal in poultry feed (FREITAS et al, 2013), as this is a product that is widely available on the market through its link to the processes of ethanol production (LOPES et al, 2011). The interest in this ingredient concerning animal feed is founded principally on its high rate of protein, at around 37.20% of crude protein, however, only 21.58% of this is digestible (ROSTAGNO et al, 2011).…”

Technical-economic analysis of different lighting systems for broiler poultry

“…Subsequently, electricity demand, consumption and its costs were estimated, as well as the initial investment for system installation. Electricity parameters, its costs and lamp operating life (Table 4) (RIGOBELO et al, 2011;LEITE et al, 2011;ABREU et al, 2011;FREITAS et al, 2013). The number of daylight hours was estimated daily for the city of Lavras -MG (latitude 21º14' S, longitude 45º00' W and 918 m altitude) by equation 1 (CAMPBELL & NORMAN 1998).…”

Energy values of traditional ingredients and sugarcane yeast for laying hens

“…drying method, also contributes to changes in yeast chemical composition (Freitas et al, 2013). Relative to corn and SBM, cultivar and processing method may also affect their chemical composition.…”